This makes sense to me. mark_for_escaping() seems like a no-op to me.

On Sat, Mar 5, 2016 at 11:16 AM, Tim Graham <timogra...@gmail.com> wrote:

> Aymeric raised this ticket [0] while working on multiple template engines:
>
>
> "Since any data that isn't explicitly marked as safe must be treated as
> unsafe, I don't understand why we have EscapeData and its subclasses nor
> the mark_for_escaping function. It seems to me that we could keep only
> the "safe" half of django.utils.safestring and deprecate the "escape" half.
> As a matter of fact the "escape" isn't used meaningfully anywhere in
> Django."
>
>
> I implemented a proof of concept to show what things would look like after
> the deprecation completes:
>
> https://github.com/django/django/pull/6015
>
>
> It removes usage of mark_for_escaping() and EscapeData in the template
> engine to give an idea of what the code might look like with them removed.
> It wasn't difficult to get the tests passing besides a couple modifications
> to tests in test_force_escape.py which don't seem like practical usage
> (chained usage of escape|force_escape).
>
>
> Here's a test case that demonstrates a small behavior change that would
> happen:
>
>
> @setup({'chaining111': '{% autoescape off %}{{ a|escape|add:"<script>" }}{% 
> endautoescape %}'})
> def test_chaining111(self):
>     output = self.engine.render_to_string('chaining111', {'a': 'a < b'})
>     self.assertEqual(output, 'a &lt; b&lt;script&gt;')
>
>
> The documentation for the escape filter says,
>
> The escaping is only applied when the string is output, so it does not
> matter where in a chained sequence of filters you put escape: it will
> always be applied as though it were the last filter. If you want escaping
> to be applied immediately, use the force_escape filter.
>
> My implementation changes this so that the escape filter no longer
> executes after all other filters (it runs conditional_escape() right
> away). This means that the above test fails and the output is: 'a &lt;
> b<script>'.
>
>
> The behavior of escape running last no matter its position doesn't seem
> so intuitive, but it could be problematic to simply change it. A way
> forward could be to deprecate the escape filter in favor of a new filter
> called conditional_escape which would simply call the function of the
> same name. With the new filter, template authors will get equivalent
> behavior to escape as long as they put this filter last.
>
>
> Alternatively, we could raise a deprecation warning if the escape filter
> isn't last in the list of filters and then change the behavior to use
> conditional_escape() at the end of the deprecation period. This has the
> potential to be less safe for users, however, as a project might skip over
> the Django versions with the warnings and not realize the behavior has
> changed. On the other hand, I hope few users are running with autoscape off
> and writing code like the test.
>
>
> What do you think?
>
>
> [0] https://code.djangoproject.com/ticket/24046
>
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